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Modelling of aluminium foam sandwich panels
Vincenzo D’Alessandro,Giuseppe Petrone,Sergio De Rosa,Francesco Franco 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
applications thanks to the excellent combination of mechanical properties, high strength and stiffness, with functional ones, thermo-acoustic isolation and vibration damping. These properties strongly depend on the density of the foam, the morphology of the pores, the type (open or closed cells) and the size of the gas bubbles enclosed in the solid material. In this paper, the vibrational performances of two classes of sandwich panels with an Alulight R foam core are studied. Experimental tests, in terms of frequency response function and modal analysis, are performed in order to investigate the effect of different percentage of porosity in the foam, as well as the effect of the random distribution of the gas bubbles. Experimental results are used as a reference for developing numerical models using finite element approach. Firstly, a sensitivity analysis is performed in order to obtain a limit-but-bounded dynamic response, modelling the foam core as a homogeneous one. The experimental-numerical correlation is evaluated in terms of natural frequencies and mode shapes. Afterwards, an update of the previous numerical model is presented, in which the core is not longer modelled as homogeneous. Mass and stiffness are randomly distributed in the core volume, exploring the space of the eigenvectors.
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Modelling of aluminium foam sandwich panels
D'Alessandro, Vincenzo,Petrone, Giuseppe,De Rosa, Sergio,Franco, Francesco Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
Aluminium Foam Sandwich (AFS) panels are becoming always more attractive in transportation applications thanks to the excellent combination of mechanical properties, high strength and stiffness, with functional ones, thermo-acoustic isolation and vibration damping. These properties strongly depend on the density of the foam, the morphology of the pores, the type (open or closed cells) and the size of the gas bubbles enclosed in the solid material. In this paper, the vibrational performances of two classes of sandwich panels with an Alulight(R) foam core are studied. Experimental tests, in terms of frequency response function and modal analysis, are performed in order to investigate the effect of different percentage of porosity in the foam, as well as the effect of the random distribution of the gas bubbles. Experimental results are used as a reference for developing numerical models using finite element approach. Firstly, a sensitivity analysis is performed in order to obtain a limit-but-bounded dynamic response, modelling the foam core as a homogeneous one. The experimental-numerical correlation is evaluated in terms of natural frequencies and mode shapes. Afterwards, an update of the previous numerical model is presented, in which the core is not longer modelled as homogeneous. Mass and stiffness are randomly distributed in the core volume, exploring the space of the eigenvectors.
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Germana de Nucci,Maria Chiara Petrone,Nicola Imperatore,Edoardo Forti,Roberto Grassia,Silvia Giovanelli,Laura Ottaviani,Vincenzo Mirante,Giuseppe Sabatino,Carlo Fabbri,Mauro Manno,Paolo Giorgio Arcidi 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.2
Background/Aims: Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) is the go-to method for obtaining samplesfrom gastrointestinal tract and pancreatic lesions. When the transduodenal approach is utilized, the use of a more flexible needle,such as a nitinol 19-gauge (G) needle, has been recommended. The aim of this study was to evaluate the feasibility and accuracy of19-G flexible aspiration needles in obtaining samples from solid lesions through a transduodenal approach. Methods: This was a retrospective analysis of prospectively collected data from eight Italian endoscopy centers. Consecutive patientswith solid lesions who underwent transduodenal EUS-FNA with a 19-G flexible needle were included. Results: A total of 201 patients were enrolled. According to histology, EUS, radiology and 12 months of follow-up, 151 patientshad malignant lesions and 50 patients had benign lesions. EUS-FNA was feasible in all cases. An adequate histologic sample wasobtained in all except eight cases (96.1%). The sensitivity of EUS-FNA was 92.1% (95% confidence interval [CI], 86.8%–95.7%), andthe specificity was 100% (95% CI, 90.5%–100%). The positive predictive value was 100% (95% CI, 93.4%–100%), and the negativepredictive value was 74% (95% CI, 62.8%–82.7%). The diagnostic accuracy was 93.5% (95% CI, 89.2%–96.5%). Conclusions: The transduodenal approach for obtaining samples from solid lesions using a 19-G flexible needle seems feasible andaccurate.
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